Tony winner Bernadette Peters and Josh Lucas will guest-star on NBC's Will & Grace in the series' next-to-last episode on May 11. Peters will portray Karen's (Megan Mullally) sister while Lucas offers Jack sympathy after an embarrassing professional setback.

In the episode - "Whatever Happened to Baby Gin? -- Grace (Debra Messing) and Will (Eric McCormack) are excited about becoming parents to her baby. While Vince (guest star Bobby Cannavale) finds a beautiful brownstone that he and Will can live in, he doesn't see Grace as part of the plan.

In the meantime, Grace learns some surprising personal news while Karen's sister, Ginny (Peters), who was injured during a game of Twister when the two were kids, appears back in her life. Meanwhile, Jack's show "The Badge" premieres, but his voice is dubbed by another deemed to be "more manly." Fortunately, Lucas offers him solace.

The Emmy Award-winning comedy concludes its eight-year run on Thursday, May 18 (9-10 p.m. ET).